int (*fptr[])(beg*) = { NULL, D_Add_room, D_Add_pathway, D_Delete_room, D_Find_exit,
                              D_Show, D_Timing, D_File_in, D_File_out, D_Random_Generation };

int getInt(int* pn) {
    const char* errmsg = "";
    int n;
    do {
        puts(errmsg);
        errmsg = "Repeat input";
        n = scanf_s("%d", pn);
        if (n < 0)
            return 0;
        scanf_s("%*[^\n]");
        scanf_s("%*c");
    } while (n == 0);
    return 1;
}
char* getStr() {
    char* ptr = (char*)malloc(sizeof(char));
    char buf[81];
    int n, len = 0;
    *ptr = '\0';
    do {
        n = scanf_s("%80[^\n]", buf, 81);
        if (n < 0) {
            free(ptr);
            return NULL;
        }
        else
            if (n) {
                len += strlen(buf);
                ptr = (char*)realloc(ptr, len + 1);
                int k = strcspn(buf, "\0"); // длина слова
                int l = strlen(ptr) + k + 1;
                strncat_s(ptr, l, buf, k);
            }
    } while (n > 0);
    scanf_s("%*c");
    return ptr;
}
int dialog(const char* msgs[], int N) {
    const char* errmsg = "";
    int rc;
    int i, n;
    do {
        puts(errmsg);
        errmsg = "You are wrong. Repeate, please!";
        for (i = 0; i < N; ++i)
            puts(msgs[i]);
        puts("Make your choice: --> ");
        n = getInt(&rc);
        if (n == 0)
            rc = 0;
    } while (rc < 0 || rc >= N);
    return rc;
}
int main() {
    beg maze=init();

    int rc;
    while (rc = dialog(msgs, NMsgs))
        if (!fptr[rc](&maze))
            break;

    if (FileOpenFlag)
        D_File_out(&maze);

    deleteall(&maze);
    return 0;
}